Supporting means for electric motors



March 31, 1931. c. L. KENNEDY 1,793,846

SUPPORTING MEANS FOR ELECTRIC MOTORS Filed May 6, 1926 W/M vW PatentedMar. 31, 1931 I UNITED STATES PATENT OFFICE CARLTON L. KENNEDY, 0FBRAINTREE, MASSACHUSETTS, ASSIGNOR TO THE HOLTZER- CAIBOT ELECTRICCOMPANY, OF ROXBURY, MQSSACHUSETTS, A CORPORATION OF MASSACHUSETTSSUPPORTING MEANS FOR ELECTRIC MOTORS Application filed May 6, 1926.

The present invention relates to an improvement in supporting means forelectric motors, and more particularly to variable torque motors.

Electric motors of the single phase type produce a pulsating torquewhich causes a rotational vibration which is transmitted to any resonantsupport to which the motor may be attached, causing the latter to emit asound or noise which for certain uses, is objectionable. It has beenproposed to interpose resilient means such as rubber or felt between themotor and the support to which it is at tached, where the noise or soundis objectionable. These flexible methods of mounting, however, havepermitted movements of the motor under the stress of driving deflectionsuch as belt pull or gear resistance.

The object of the present invention is to produce a construction whichwill not only absorb the rotational vibrations of variable torquemotors, but which also will support the motor with sufficient rigidityto prevent driving deflection due to belt pull or gear resistance. Tothis end the invention consists in the motor support hereinafterdescribed and particularly defined in the claims.

In the accompanying drawings illustrating a preferred form of theinvention, Fig. 1 is an end view of the motor and its support; and Fig.2 is a front elevation of the same.

The illustrated embodiment of the invention is described as follows: Theframe or base of the motor support consists of a plate 10 having bars 12secured thereto at opposite ends. These bars have upturned ends 14 towhich resilient arms 16 are secured. These arms extend from oppositesides of the base toward the axis of the rotor shaft 18 of the motor 20.The arms 16 are secured to the ends 14 of the bar 12 by means of thescrews 22, and the other ends of. the arms are secured to the varyingportions of the frame of the motor by similar screws 24. These arms 16are made of ribbon steel such as clock spring steel, and they lie in theplane of the axis of the motor rotor. They thereby prevent endwisemovement of the motor while permitting rotational vibrations of the m0-tor. The arms 16, being arranged in the 'means of bolts or screws SerialNo. 107,240.

form of a truss comprising thebase and the arms, and having sufficientflexural strength to prevent buckling under the stresses of drivingdeflection, support the motor against the stresses of belt pull or gearresistance while at the same time permitting the vibrations of the motordue to any inequalities of torque. They therefore absorb such torquevibrations and prevent the emission of sound or noise by the body bywhich the base of the supporting means is carried. The base 10 of thesupporting means is adapted to be secured to the body to which itisattached by which pass through the holes 26 of the base.

It is to be observed that this supporting means is adapted to carry themotor with the base in any position with respect thereto. Thebase may besupported upon the floor, ceiling, side wall or inclined support, andthe shaft may be horizontal or vertical. The arms 16 may be made of anyresilient metal or other material of suflicient rigidity and elasticityto afford substantially rigid support of the motor against the stressestending to driving deflection, while permitting rotational vibrations.be made of various widths, and in a case where the arms aresubstantially as Wide as the length of the motor, two arms would besufficient for its adequate support. The minimum number of arms isobviously two, as without such number a formed, but a considerablenumber of arms may be employed if desired. When a large number isemployed, the flexural strength of the individual arms will be reduced,but in all cases the arms must be arranged with their resilient portionslying in directions radial to the axis of the rotor or the center ofinertia of the motor.

The arms may a truss would not be.

not necessarily fiat, as a number of arms of symmetrical transversesection may be employed side by side in place of a single fiat arm, aplurality of such arms having all the qualities of the flat arms'shownin the drawings.

Having thus described the invention, what is claimed 1s:

1. A variable tor ue electric motor and support having in com ination, amotor, a frame and resilient arms of sheet material rigidly attached tothe frame and extended toward the rotor axis of the motor and rigidlysecured thereto with planes of the arms intersecting the axis of themotor rotor to hold the motor from movement tor axis, said arms beingextended upwardly and inwardly and arranged at an angle to each other sothat they form a truss to support the motor against substantial bodilymovement and being springy as to permit rotational vibrations due tovariations of motor torque without transmission thereof to the frame.

2. A variable torque electric motor and support having, in combination,a motor, a frame, a pair of arms of flat flexible metal rigidly securedto the frame and extended angularly upward toward each other on linesintersecting at the axis ofthe motor rotor rigidly secured to one end ofthe motor, and a similar pair of arms at the other end of the motorsimilarly arranged with respect to the rotor axis and similarlyconnected to the frame and the motor.

In testimony whereof name to this specification.

CARLTON L.' KENNEDY.

axially of the mov I have signed my

